Ultra wide band signal generator

Abstract

Disclosed is an ultra wide band signal generator. The ultra wide band signal generator generates a signal of a required frequency using a harmonic signal having a frequency range of a ultra wide band (UWB). The ultra wide band signal generator includes an active inductor for generating harmonic signals having power strengths substantially equal to each other within a non-linear operation range, the tunable active inductor capable of tuning a value thereof, an oscillator for amplifying and outputting the harmonic signals generated from the active inductor by frequency-transiting the harmonic signals into high frequency bands, and a filter for selectively outputting one of the harmonic signals output from the oscillator.

1. An ultra wide band signal generator, comprising:
 a tunable active inductor for generating harmonic signals having power strengths substantially equal to each other within a non-linear operating range, the tunable active inductor being capable of tuning a value thereof, comprising:
 a first transistor having a source connected to a voltage source and a gate connected to a first bias voltage; 
 a second transistor having a drain connected to a drain of the first transistor and a gate connected to a second bias voltage; 
 a third transistor having a drain connected to a source of the second transistor and a source connected to ground; 
 a fourth transistor having a drain connected to a gate of the third transistor, a source connected to the ground, and a gate connected to a third bias voltage; 
 a fifth transistor having a source connected to the drain of the fourth transistor and a drain connected to the voltage source; and 
 a tunable feedback resistor interposed between the drain of the first transistor and a gate of the fifth transistor; 
 
 an oscillator for amplifying and outputting the harmonic signals generated from the tunable active inductor by frequency-transiting the harmonic signals into high frequency bands; and 
 a filter for selectively outputting one of the harmonic signals output from the oscillator. 
 
   
   
     2. The ultra wide band signal generator as claimed in  claim 1 , wherein the tunable feedback resistor further comprises:
 a first resistor interposed between the drain of the first transistor and the gate of the fifth transistor; and 
 a sixth transistor having a drain connected to the drain of the first transistor, a source connected to the gate of the fifth transistor, and a gate connected to a fourth bias voltage. 
 
   
   
     3. The ultra wide band signal generator as claimed in  claim 1 , wherein the oscillator comprises:
 a seventh transistor having a base connected to the tunable active inductor; 
 a first capacitor interposed between the tunable active inductor and the seventh transistor; 
 a third resistor interposed between a fifth bias voltage and the base of the seventh transistor; 
 a second capacitor interposed between the base of the seventh transistor and an emitter of the seventh transistor; 
 a third capacitor interposed between ground and the second capacitor; 
 a first current source interposed between the emitter of the seventh transistor and ground; 
 a first inductor interposed between a voltage source and a collector of the seventh transistor; and 
 a fourth capacitor interposed between the collector of the seventh transistor and an output port. 
 
   
   
     4. The ultra wide band signal generator as claimed in  claim 3 , wherein the filter performs filtering by using a first inductor and a first variable capacitor interposed between the collector of the seventh transistor and ground. 
   
   
     5. The ultra wide band signal generator as claimed in  claim 1 , wherein the oscillator comprises:
 an eighth transistor having a base interposed between the tunable active inductor and a sixth bias voltage; 
 a fifth capacitor interposed between the tunable active inductor and the eighth transistor; 
 a second variable capacitor interposed between the base of the eighth transistor and an emitter of the eighth transistor; 
 a third variable capacitor interposed between the second variable capacitor and ground; 
 a fourth resistor interposed between the emitter of the eighth transistor and ground; 
 a second inductor interposed between the voltage source and the collector of the eighth transistor; and 
 a sixth capacitor interposed between the collector of the eighth transistor and the output port. 
 
   
   
     6. The ultra wide band signal generator as claimed in  claim 5 , wherein the filter performs filtering by using a second inductor and a fourth variable capacitor interposed between the emitter of the eighth transistor and ground. 
   
   
     7. An ultra wide band signal generator, comprising:
 a tunable active inductor for generating harmonic signals having power strengths substantially equal to each other within a non-linear operating range, the tunable active inductor being capable of tuning a value thereof; 
 a first transistor having a base connected to the tunable active inductor; 
 a first resistor interposed between a first bias voltage and the base of the first transistor; 
 a first capacitor interposed between the base and the emitter of the first transistor; 
 a second capacitor interposed between the first capacitor and ground; 
 a first current source interposed between the emitter of the first transistor and ground; 
 a first inductor interposed between a voltage source and a collector of the first transistor; 
 a third capacitor interposed between a collector of the first transistor and an output port; and 
 a first variable capacitor interposed between a collector of the first transistor and ground. 
 
   
   
     8. The ultra wide band signal generator as claimed in  claim 7 , wherein the tunable active inductor comprises:
 a second transistor having a source connected to the voltage source and a gate connected to a second bias voltage; 
 a third transistor having a drain connected to a drain of the second transistor and a gate connected to a third bias voltage; 
 a fourth transistor having a drain connected to a source of the third transistor and a source connected to ground; 
 a fifth transistor having a drain connected to a gate of the fourth transistor, a source connected to ground, and a gate connected to a fourth bias voltage; 
 a sixth transistor having a source connected to the drain of the fifth transistor and a drain connected to the voltage source; and 
 a first tunable resistance interposed between the drain of the second transistor and a gate of the sixth transistor. 
 
   
   
     9. The ultra wide band signal generator as claimed in  claim 8 , wherein the first tunable resistance comprises:
 a second resistor interposed between a drain of the second transistor and a gate of the sixth transistor; and 
 a seventh transistor having a drain connected to the drain of the second transistor, a source connected to the gate of the sixth transistor, and a gate connected to a fifth bias voltage. 
 
   
   
     10. An ultra wide band signal generator, comprising:
 a tunable active inductor for generating harmonic signals having power strengths substantially equal to each other within a non-liner operation range, the tunable active inductor being capable of tuning a value thereof; 
 a first transistor having a base connected to the tunable active inductor and a sixth bias voltage; 
 a first capacitor interposed between the tunable active inductor and the first transistor; 
 a first variable capacitor interposed between the base and an emitter of the first transistor; 
 a second variable capacitor interposed between ground and the first variable capacitor; 
 a first resistor interposed between the emitter of the first transistor and ground; 
 a first inductor interposed between a voltage source and a collector of the first transistor; 
 a second capacitor interposed between a collector of the first transistor and an output port; and 
 a third variable capacitor interposed between a collector of the first transistor and ground. 
 
   
   
     11. The ultra wide band signal generator as claimed in  claim 10 , wherein the tunable active inductor comprises:
 a second transistor having a source connected to the voltage source and a gate connected to a first bias voltage; 
 a third transistor having a drain connected to a drain of the second transistor and a gate connected to a second bias voltage; 
 a fourth transistor having a drain connected to a source of the third transistor and a source connected to ground; 
 a fifth transistor having a drain connected to the gate of the fourth transistor, a source connected to the grounding, and a gate connected to a third bias voltage; 
 a sixth transistor having a source connected to the drain of the fifth transistor and a drain connected to the voltage source; and 
 a first tunable resistance interposed between the drain of the second transistor and the gate of the sixth transistor. 
 
   
   
     12. The ultra wide band signal generator as claimed in  claim 11 , wherein the first tunable resistance comprises:
 a second resistor interposed between the drain of the second transistor and the gate of the sixth transistor; and 
 a seventh transistor having a drain connected to the drain of the second transistor, a source connected to the gate of the sixth transistor, and a gate connected to a fourth bias voltage.